Sigma 813509007 Ground Joint Pipe Union 1-1/2 in Fnpt 150 Lb

Product Description

The SIGMA 813509007 is a FIG 3463 ground joint pipe union rated for 150 lb service in galvanized malleable iron construction. Ground joint unions provide a metal-to-metal seat between the two pipe ends, creating a secure, leak-resistant connection that can be assembled and disassembled without cutting pipe. This union is threaded with female NPT (FNPT) ends and is sized at 1-1/2 inches nominal. It is a standard fitting used in gas, steam, and water piping systems by licensed plumbers and pipefitters working in commercial and industrial environments.

This union is suited for residential and light commercial plumbing and mechanical piping installations where a serviceable threaded connection is required. Common applications include boiler piping, gas supply lines, water distribution headers, and mechanical room piping where future maintenance access is needed. The galvanized finish provides corrosion resistance for installations in damp or outdoor-adjacent environments. It is typically installed in systems operating within the pressure and temperature limits of 150 lb malleable iron fittings.

Key Features

• Ground joint metal-to-metal seat for a secure, serviceable connection
• 1-1/2 inch nominal size with FNPT end connections on both sides
• 150 lb pressure class malleable iron construction
• Galvanized finish for corrosion resistance in wet or damp service environments
• Allows pipe disassembly without cutting, simplifying future maintenance

Compatibility

Designed as an OEM-style replacement or new-installation fitting compatible with standard 1-1/2 inch NPT threaded pipe systems rated for 150 lb malleable iron fittings.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and the International Plumbing Code (IPC) or International Fuel Gas Code (IFGC) where relevant. Shut off and depressurize the system completely before removing or installing any union fitting. Apply appropriate thread sealant or PTFE tape to NPT threads before assembly. Do not over-tighten the union nut, as this can damage the ground joint seat and compromise the seal.

Technical Specifications

• Nominal Size: 1-1/2 inches
• End Style: FNPT (Female National Pipe Thread)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Figure Number: FIG 3463

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 813509007